Add python package crest4 to staged-recipes.

[xapple]

Adding crest4 from PyPI for distribution on conda-forge.

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[xapple]

This recipe depends on two another packages that I also submitted for review earlier (so those ones should be accepted first before this one builds):

• seqsearch
• optmagic

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/crest4/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipes/crest4/meta.yaml:

• ℹ️ noarch: python recipes should usually follow the syntax in our documentation for specifying the Python version.
  • For the host section of the recipe, you should usually use the pin python {{ python_min }} for the python entry.
  • For the run section of the recipe, you should usually use the pin python >={{ python_min }} for the python entry.
  • For the test.requires section of the recipe, you should usually use the pin python {{ python_min }} for the python entry.
  • If the package requires a newer Python version than the currently supported minimum version on conda-forge, you can override the python_min variable by adding a Jinja2 set statement at the top of your recipe (or using an equivalent context variable for v1 recipes).

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